#
# Copyright 2016 The BigDL Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#


import hashlib

def to_hex_string(ids, salt, padding_size=32):
    hashing = hashlib.sha384()
    hex_string = []
    for ch in ids:
        hashing.update(bytearray(ch, 'utf-8') + bytearray(salt, 'utf-8'))
        ch = hashing.hexdigest()
        while len(ch) < padding_size:
            ch.insert(0, '0')
        hex_string.append(ch)
    return hex_string